+;;;; -----------------------------------------------------------------
+;;;; Windows shortcut support. Based on:
+;;;;
+;;;; Jesse Hager: The Windows Shortcut File Format.
+;;;; http://www.wotsit.org/list.asp?fc=13
+
+#-(or clisp genera) ; CLISP doesn't need it, and READ-SEQUENCE annoys old Genera.
+(progn
+(defparameter *link-initial-dword* 76)
+(defparameter *link-guid* #(1 20 2 0 0 0 0 0 192 0 0 0 0 0 0 70))
+
+(defun* read-null-terminated-string (s)
+ (with-output-to-string (out)
+ (loop :for code = (read-byte s)
+ :until (zerop code)
+ :do (write-char (code-char code) out))))
+
+(defun* read-little-endian (s &optional (bytes 4))
+ (loop :for i :from 0 :below bytes
+ :sum (ash (read-byte s) (* 8 i))))
+
+(defun* parse-file-location-info (s)
+ (let ((start (file-position s))
+ (total-length (read-little-endian s))
+ (end-of-header (read-little-endian s))
+ (fli-flags (read-little-endian s))
+ (local-volume-offset (read-little-endian s))
+ (local-offset (read-little-endian s))
+ (network-volume-offset (read-little-endian s))
+ (remaining-offset (read-little-endian s)))
+ (declare (ignore total-length end-of-header local-volume-offset))
+ (unless (zerop fli-flags)
+ (cond
+ ((logbitp 0 fli-flags)
+ (file-position s (+ start local-offset)))
+ ((logbitp 1 fli-flags)
+ (file-position s (+ start
+ network-volume-offset
+ #x14))))
+ (strcat (read-null-terminated-string s)
+ (progn
+ (file-position s (+ start remaining-offset))
+ (read-null-terminated-string s))))))
+
+(defun* parse-windows-shortcut (pathname)
+ (with-open-file (s pathname :element-type '(unsigned-byte 8))
+ (handler-case
+ (when (and (= (read-little-endian s) *link-initial-dword*)
+ (let ((header (make-array (length *link-guid*))))
+ (read-sequence header s)
+ (equalp header *link-guid*)))
+ (let ((flags (read-little-endian s)))
+ (file-position s 76) ;skip rest of header
+ (when (logbitp 0 flags)
+ ;; skip shell item id list
+ (let ((length (read-little-endian s 2)))
+ (file-position s (+ length (file-position s)))))
+ (cond
+ ((logbitp 1 flags)
+ (parse-file-location-info s))
+ (t
+ (when (logbitp 2 flags)
+ ;; skip description string
+ (let ((length (read-little-endian s 2)))
+ (file-position s (+ length (file-position s)))))
+ (when (logbitp 3 flags)
+ ;; finally, our pathname
+ (let* ((length (read-little-endian s 2))
+ (buffer (make-array length)))
+ (read-sequence buffer s)
+ (map 'string #'code-char buffer)))))))
+ (end-of-file ()
+ nil)))))
+